Builder s jack



UNITED STATES PATENT EEICE,

JOHN CALLAHAN, OF DURANGO, COLORADO.

eulLol-:Rs JACK.

SPECIFICATION forming part of Letters Patent No. 494,842, dated April 4, 1893.

Application filed August 18, 1892. Serial NoL 443,895. (No model.)

To @ZZ whom it may concern:

Be it known that I, JOHN OALLAHAN, of Durango, in the county of La Plata and State of Colorado, have invented a new and Improved Builders Jack, of which the following is a full, clear, and exact description.

My invention is an improved jack for carpenters or builders use, it being particularly adapted for squaring or adjusting window frames, or sashes, and for other analogous purposes.

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter` fully set forth and pointed out in the claim.

Reference is to be had to the accompanying drawings forming a part of this specication, in which similar figuresof reference indicato corresponding parts in all the views.

Figure 1 is a side elevation of the jack. Fig. 2 is a central longitudinal section taken practically on the line 2-2 of Fig. l; and Fig. 3 is a transverse section taken essentially on the line 3-3 of Fig. 1.

In carrying out the invention two sockets 10 and 11, are employed, and these sockets are preferably made rectangular in general contour, their recesses being also rectangular. One of the sockets has integral with or attached to its inner end a hub 12, and this hub is interiorly threaded to receive the threaded end of a screw 13, the head portion of which screw is swiveled in the inner end section of the opposing socket 10, and the screw is manipulated in such manneras to bring the sockets in direction of cach other or carry them a required distance apart, through the medium et a head 14, having radial projections which as is shown in Fig. 3, is rmly attached to the neck of the screw. Thishead preferably conwhen desirable, be carried through openings 18, produced in the sides of the sockets opposite those in which the set screws are supported. The sockets are adapted to hold or to receive any object capable of entering them; and when the tool is employed in straightening a window frame or window sash, for instance, blocks 19, are located in the sockets, being held therein hy the set screws 17, and the outer ends of the blocks are beveled, as shown in dotted lines in Fig. 2. Nhen so used the jack is placed diagonally of the frame, the beveled ends of the blocks 19 entering diagonally opposite corners of the frame; and by the manipulation of the head 14 the sockets are forced far enough apart to bring the frame or sash operated upon into perfect rectangular shape.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The earpenters jack composed of the two sockets 10 and 11 having rectangular recesses and open at their outer and opposite ends, a set screw working through one side of each socket, a screw 13, and a head 14, secured to the screw and connecting the two sockets adj ustably as shown and described.

JOHN OALLAHAN.

"Witnesses:

L. M. Woon, FRANK FEAKES. 

